Expansion bolt-anchor.



- I. KENNEDY.

EXPANSION BOLT ANCHOR. APPLICATION FILED AUG. 14, 1913.

1,1 12,069, Patented Sept. 29, 1914.

NVENTOI? f j TED omweg-guur ermee.

JQSEPH KENNEDY, OF

NEW YORK, N. Y., ASSIGNOR TQ THE @LMENTS COMPANY, A

conPomTIoN or NEW Yoan.

l EXPANSION BOLT-.ANCHOR meshes.;-

specmwmof'uwent. Patented sept. 29, 1914.r

Application tiled August 14, 1913. Serial No. 784,6?5.

l To all whom it may concern:

Be it known that I, JOSEPH KENNEDY, a citizen of the United States, anda resident of New York, county and State of New York, have inventedcertain new and useful Improvements in Expansion Bolt-Anchors, of whichthe following is a specification, reference beinghad to the accompanyingdrawings, forming a. part thereof.

My invention relates to .bolt anchors such as can he expanded within ahole drilled in a wall, floor or other structure and thus secui-elyallixed to the structure. lts object is to provide an extremelyeffective device of this character which has advantages over thoseheretofore known.

I will describe my invention in the following specification, and thenpoint out the novel features thereof in appended claims.

y Referring to the drawings, Figure l is a sectional elevation of a wellwith an expansion bolt anchor 'therein' which is made in accordance withthis invention. In Fig. 2

the anchor itself is shown in longitudinal` elevation with its outermember shown in section. A. transverse section of the device illustratedin Fig. 2v is shown in Fig. 3, the section in this figure being taken onthe line 3-3 of Fig. 2.

Like characters of reference designate corresponding parts in all'thefigures.

According to this invention, the bolt anchor tomprises an inner member10 of hard metal, and an outer member 11 of soft metal. ln va desirableform which is illustrated in Figs. l, 2 and 11, the inner member isinternally threaded as at l2 to receive the threads 'of a bolt and itsouter surface is constructed 'in the form of a series of truncated cones13 which taper toward the outer end of the device. These cones may beand preferably are of transverse dimensions progressively increasingtoward the inner end of theA device with their major bases overlappingthe minor bases of the adjacent cones.

The outer member 1l which may be of lead for example, fits over thenotched surface of the inner member and extends bcyond the front endthereof. Through this part which extends in front of the inner member isa clearance hole ll for the bolt which is to be used with the device.The

outer surface of the outer member is shown as cylindrical although l donot 'intend to limit myself t'o-this particular form.

Referring now to Fig. 11 I Will describe the manner in which this deviceis used. A hole 20 is drilled in a structure 21 of about the diameter ofthe outer member l1 `and of a depth somewhat greater than the length ofthe ,anchor device. The latter is then inserted in this hole and a boltpassed through a Washer 23, which overlaps the outer end of the hole 20,and screwed into/ the threads l2 of the inner member. As soon as thehead of the bolt en ages the washer, the inner member will be rawntoward the outside of the hole forcing itself through the soft outermember and on account of Athe wedge-like form of its outer surface,forcing the material ofl the outer member against the surface of thehole. The anchorage member thus becomes s ecurely affixed to. thestructure 21. If dee sired the bolt may be removed and inserted again atwill as the threaded bore of the internal member forms durable screwthreads for the reception of the threads of the bolt.

Various modifications o f this invention may be made within the spiritand scope of the claims.

lVhat l claim is: 1,'An expansion bolt anchor comprising an inner memberof hard metal having a longitudinal' bore., the outside of said mem berbeing in the form ofv a series of truncated cones. and a relativelymovable outer member of soft metal fitting over the inner,

member and extending beyond the smaller part olf said outer member beingprovided with a clearance hole in alinement with the threaded hole inthe inner member.

3. An expan menos sion bolt anchor comprising In testimony whereof Ihave hereunto set'.

m hand n the presence of t wo subscribing wltnesses, this 11th dey ofAugust, 1913.

JOSE?H KENNEDY.

Witnesses B. MOORE,

EDNA ZINMAN.

